In case of any dispute under section 47 or 48 the decision of the Chief Presidency Magistrate, in Greater Bombay, and the District Magistrate, in the district, shall be conclusive as to the amount to be paid and as to the person by whom it is to be paid and the sum so ascertained may, on the requisition of the Chief Presidency Magistrate or the District Magistrate be recovered by the Collector as if it were an arrear of land revenue due by the person found to be answerable therefor.